Explain a bit more what this does.

svn path=/trunk/; revision=37884

wiretap/mime_file.c

@@ -2,6 +2,15 @@
  *
  * MIME file format decoder for the Wiretap library.
  *
+ * This is for use with Wireshark dissectors that handle file
+ * formats (e.g., because they handle a particular MIME media type).
+ * It breaks the file into chunks of at most WTAP_MAX_PACKET_SIZE,
+ * each of which is reported as a packet, so that files larger than
+ * WTAP_MAX_PACKET_SIZE can be handled by reassembly.
+ *
+ * The "MIME file" dissector does the reassembly, and hands the result
+ * off to heuristic dissectors to try to identify the file's contents.
+ *
  * $Id$
  *
  * Wiretap Library